Boiler tube and flue scraper.



PATENTED AUG. 2, 1904.

0. E. LLOYD. BOILER TUBE AND FLUE SGRAPER.

APPLIOATION FILED JUNE 19, 1903.

2 SHEETS-SHEET 1.

N0 MODEL.

D ax- INVENTORY 04. n. mew

N0 MODEL.

0. E. LLOYD.

PATENTED AUG. 2, 1904.

BOILER TUBE AND FLUE SGRAPER.

APPLIOATION FILED mm: 1a, 1903.

mun.

2 SHEETS-SHEET 2.

INVENTOR.

UNITED STATES Patented August 2 1904.

PATENT OFFICE.

BOILER TUBE AND FLUE SCRAPER.

SPECIFICATION forming part of Letters Patent No. 766,712, dated August 2, 1904.

I Application filed June 19, 1903. Serial No. 162,192. (No model.)

To all whom, it may concern.-

Be it known that 1, CHARLES E. LLOYD, a citizen of the United States, residing at Philadelphia, in the countyof Philadelphia and Stateof Pennsylvania. have invented certain Improvements in Boiler Tube and Flue Scrapers, of which the following is a specification.

The primary purpose of the invention is to scrape deposits, scales. and incrustations from the interior of boiler-tubes in a rapid and effective manner and to automatically check the scraping action when such scales or deposits have been removed.

The nature and characteristic features of the improvements will more fully appear by reference to the following description and the accompanying drawings in illustration thereof, of which Figure 1 represents a side elevation of the invention. Fig. 2 represents a front elevation thereof. Fig. 3 represents a sectional View taken on the line 3 3 of Fig. 1. Fig. at represents a sectional view taken on the line 4: 4 of Fig. 1. Fig. 5 represents a detail view showing in section the relation between the turbine-vanes and the jetting ports leading thereto. Fig. 6 represents a longitudinal sectional view of the invention. Fig. 7 represents a sectional view taken on the line 7 7 of Fig. 6. Fig. 8 representsa perspective view of the conical spider or skeleton hub for carrying the blades. Fig. 9 represents a perspective view of a cutting-blade. Fig. 10 represents a perspective view of the guard-blade, and Fig. 11 represents a side elevation of the guard-blade in its relation to the interior surface of a tube.

Referring to the drawings, the shell 1, having the conical body portion 2, is provided with the interiorly-threaded collar 3 for engaging a hose provided with a coupling-thread at and with a flange 5, which supports the diaphragm 6. This diaphragm carries the arbor or spindle 7, on which is journaled a bucket-wheel 8, provided with the inclined vanes 9, arrangedtransversely to the inclined jetting ports 10 of the diaphragm, the bucket- Wheel periphery 11 being engaged within the flange 5 and its base engaging with the bearing-balls 12, which run in the race 13, formed in the diaphragm.

A hub 14: on the wheel is screw-threaded to engage an interiorlythreaded collar 15 of the conical spider 16, the collar bearing upon the balls 17, which run in the race 18, where they are engaged by the conical surface of the sleeve 19, adjustably mounted upon the arbor 7. The spider is provided with a collar of larger diameter than the collar 15 and connected therewith by the conical ribs 21, which provide ample port-openings 22 through the spider. The collar 20 carries the spindles or arbors 23, on which are journaled eccentrically to their cutting-faces the several groups of blades 24. The blades and arbors are held in their proper relations by triangularly-arranged truss-bars 23, and the blades are held together, so that they have a limited motion with relation to each other, by means of the pins 25, which pass through the blade-holes 26, having larger diameters than the respective pins, the respective pins being suitably fixed to one of the several blades of a group. Each group of blades comprises a guard-blade 27, having truncated teeth 28, provided with cutting edges 29 and bearing-surfaces 30, the construction being such that the cutting edges progressively cut into the interior scales or incrustations of a tube until such deposits are removed to the interior surface of the tube, when the tangential movement of the blades brings the outer truncated surfaces 30 into tangential relation with the interior of the tube 31. The truncated character of the guardblade effects a graduated engagement of the teeth with the deposit and prevents a chocking action. The holes 26 are placed successively closer to the cutting edges of the several cutting-blades 27 as the latter are farther removed from the guard-blade 27, as shown in Fig. 2, correspondingly limiting the outward movement of the successive cutting-blades. By this construction the cutting-blades 27 on either side of the guard-blades have their teeth arranged in recession therefrom, the cutting-blades farthest removed from the guardblades acting in a curve having the smallest diameter, so that in moving the scraper in either direction this progressive arrangement prevents chocking, while the play of the several blades with reference to each other, due to their holes of larger diameter than that of the pins passing therethrough, permits a flexibility in the cutting action of each group and a limited movement of each blade relative to the other. It will be seen that the cutting edges of these blades having the flexible eccentric or cam action of the character described are adapted for efi'ecting a mode of operation distinct from that resulting from the use of cutting wheels, disks, and the like which act on fixed lines as distinguished from the centrifugal movement described.

Having described my invention, I claim- 1. Inarotaryfiue-scraper for steam-boilers and the like, an integral cutter, formed with a flat body and aconvex toothed face, and adapted to be pivoted freely to the carrier upon an axis eccentric to said face and substantially parallel to the axis of said carrier, and to be thrown out by the revolution of said carrier, to aposition in which the tooth farthest from the pivot will most deeply engage the scale, and the rest will engage it in the order of their succession inward, substantially as specified. 2. Inarotary flue-scraper for steam-boilers and the like, the combination of a rotatable carrier, and an integral cutter formed with a flat body and a convex toothed face, and adapted to be pivoted freely to the carrier upon an axis eccentric to said face and substantially parallel to the axis of said carrier, and to be thrown out by the revolution of said carrier, to a position in which the tooth farthest from the pivot will most deeply engage the scale, and the rest will engage it in the order of ihelir succession inward, substantially as speci- 3. A scraper having a plurality of curved cutting-blades, means for causing the successive blades to act in curves of different diameters, and a guard-blade connected therewithand the rest will engage it in the order of their succession inward, and means for limiting the outward throw of the blade, substantially as specified.

5. In a scraper, a rotary head, a bearing carried by said head, a group of blades pivotally mounted on said bearing eccentrically to their cutting-faces, and means for causing the faces of the several blades to act simultaneously through parallel curves, the several blades being integrally formed and connected to act together, substantially as specified.

6. Ascraper having a group of revolving blades comprising a guard-blade and a cuttingblade on each side thereof, and means for causing each of said cutting-blades to act in a curve of smaller diameter than the curve of said guard-blade, substantially as specified.

, 7. Ascraper having a group of pivotallysupported cutting devices, a guarding device for limiting the actions of said cutting devices, and a pin fixed to one and passing freely through aperturesin the other of said devices to permit a limited relative movement between said devices, substantially as specified.

8. In arotary flue-scraper for steam-boilers and the like, the combination of a rotatable carrier, and an integral cutter formed with a flat body and a convex toothed face, and adapted to be pivoted freely to said carrier upon an axis eccentric to said face and substantially parallel to the axis of said carrier and to be thrown outward by the revolution of said carrier to a position in which the teeth farthest from the pivot will most deeply engage the scale and the rest will engage itin the order of their succession inward, and a guard-blade adapted to control the action of 'said cutter, substantially as specified.

9. Ascraper com prising a revolving conical spider, a plurality of cutters carried by said spider, and a turbine connected with the apex of said spider, substantially as specified.

10. A scraper comprising a revolving conical spider, a series of cutting-blades carried by said spider, in combination with a conical shell and a turbine carried by said shell and connected with the apex of said spider, substantially as specified.

In testimony whereof I have hereunto set my hand, this 17th day of June, A. D. 1903, in the presence of the subscribing witnesses.

CHARLES E. LLOYD. WVitnesses I WILLIAM E. CHAPMAN,

JEANNETTE EWING. 

